weird page generation

[grim plume]

?r

#set page(paper: "a7", numbering: "1")
#set heading(numbering: "1")
#show heading.where(level: 1): it => context {
      pagebreak(weak: true)
      if calc.even(here().page()){
        page(header: none, footer: none, numbering: none)[]
      }
    block[
    #set par(first-line-indent: 0em)
    #text(0.5em, weight: "bold")[Chapter #counter(heading).display()]
    
    #text(0.4em, weight: "bold")[#underline(it.body)]
    ]
  }
= hello
#context counter(page).get()
= h
#context counter(page).get()

[somber bear]

Render succeeded with warnings:

Warning: layout did not converge within 5 attempts

[grim plume]

ah